Aerial ladder.



C. P. KIESER.

AERIAL LADDER.

APPLIOATION FILED rms. 7, 1911.

1 ,081 1 22, Pawented Den. 9, -191'3 3 SHEETS-SHEET 1.

C. F. KIBSER.

AERIAL LADDER.

APPLICATION FILED FEB. 7. 19u

COLUMBIA PLANoaRAPM co.,\v/\shmu1ur-i. u. c.

G. F. KIESBR.

AERIAL LADDER.

APPLICATION FILED PEB. 7, 1911.

LQ8L122- Patented 1130.9, 1913.

AM Mouw coLuMmA PLANOGRMH co.. WASHINGTON, D c.

i llllldl CHARLES F. KIESER, F CLUMB'S, OHIO, J4.1155131".@NOR T0 THE SEAGRAVE COMPANY, 0F CULUIVIBUS, 01110, A CORPORABIN 0F OHIO.

AERIAL LAIDDER.

Patented Dec. 9, 1913. serial No. efr/,143.

13 projecting from the lower side (Fig. 1) of the lateral timbers ot the ladder. On the turntable 7, forward of the toot of the ladder, is a standard 1st having a bearing 15 in which is journaled a shaft 16 having' laterally extending short arm 17 and a handled arm 184 Hinged to the short arm 17 is a rod 19 that reaches rearwardly and downwardly to and through a guide bearing 20 secured between the two spring casings 8. 0n the lower end ot the rod 19 is hinged a pair of toggle links 21 having their tree ends connected with the Shanks of a pair of clamping jaws 22 that are pivoted together at 28. These clamping jaws are so formed, and located and the links operating them are so connected with the rod 19 and jaw Shanks that when the ladder' is prone the jaws can grip the bar 12 and the ladder be locked in the prone posit-ion. This locking ettect is obtained by turning the handle lever 18 down from the position seen in ll'ig. 2 to the position seen in Fig. 1 and securing said handle lever in the stirrup 2e secured on the adjacent standard G, a pin 211a being' inserted through holes in the stirrup arms above the lever to prevent the latter from rising.

35 designates a coil spring located on the rod 19 between the bearing 2O and a collar 19a to urge the jaws to open position when the rod 19 is slightly raised from locking position.

Swiveled in a nut 25 journaled at 25a at theupper end ot the standard 1e is a screw 26, ot high pitch and journaled at 27a in suitable brackets 27 in the upper side of the ladder is a nut 28 that travels on the screw 2G. rlhe screw has fixed on it at its forward end a miter gear 29 that is engaged by a pinion 33 on a shaft 31. The shaft 31 can be rotated by a suitable crank to turn the screw 26 and the screw can be locked from rotation by means et a dog 32 engaging a suitable clutch member 33 on the shat. r1`he clutch member and cooperating parts constitute the subject o another application for patent.

ln practice it is proposed that the springs 11 shall be powerful enough to automatically move the ladder to elevated position when the cross bar 12 is released. Where the springs 11 are of a power sutlicient to alone elevate the ladder against the screw 26 that member is turned and serves as a To all t0/wm may concern:

Be it known that 1, CHARLES F. Kinsnn, citizen ot the United States, residing at ColumbusE in the county of Franklin and State of tibio, have invented a certain new and useful Improvement in Aerial Ladders7 of which the following is a specification.

This invention relates to a ladder et the kind shown in the patent to Frederic S. Seagrave, No. 865,951 dated September 10, 1907, but in the present invention the ladder is automatically raised; and one of the objects of the invention is to provide devices for locking the ladder in its lowered position said devices being conveniently operated for releasing the ladder to permit the operation of the automatic raising means.

@ther objects will appear from the lt'ollowting description and claims.

The invention is embodied in the construetion herein shown and described and then particularly pointed out in the claims.

1n the accompanying' drawing-Figure 1 is a side elevation oi the lower portion or toot of the ladder showing the same in lowered and locked position. Fig. 2 is a similar view showing the same elevated. Fig. 3 is a central longitudinal section of one ot the spring cylinders and the spring of the elevating mechanism. llig. 1 is a plan view which includes two of the cylinders shown in F ig. 3. Fig. 41a is a detail plan view ot the clutching' and catching devices.

1n the views 5 designates thc ladder proper which is oit the usual or any approved construction but which is tulcrumed near its toot or forward end by means ot trunnions at 5 in brackets or standards (l secured upon turntable 7. Secured on said turn table is a pair of cylindrical casings 8, 8, containing a piston-like head 9 having a rod 10 that extends rearward through the rear end of the cylinder where it is provided with an eye 10a. rlfhe forward end of each oi the piston-like heads is provided with a powerful spring 11 that urges the rod forward and the rear end oi' the casing is provided with a spring 11a, somewhat separated from the head 9 when the spring 11 is compressed by the lowering of the ladder. A cross bar 12 connects the two rods 10 by being passed through the eyes 10a and the opposite outer ends ot the cross bar 12 are pivotally connected by means of rods 12EL with the apices of angular brackets retarder but not alone as a lock to hold the ladder. The elevating operation can be intelligently controlled by ineans of a suitable brake device operated by a lever 3d properly mounted` to operate a brake or clutch ineniber to apply friction to retard, or stop either the elevating or lowering operation. The ladder is, of course, depressed to prone position by turning the screw Q6 in a direction opposite that in which it turns when the ladder is raised.

ilflhat l yclai-in is:

l. ln a ladder ot the kind described, Ithe combination with the ladder proper, of a ulcruin on which the saine can be elevated, screaT 2G, a nut on the ladder :to engage said screw, a spring of a strength adapted to operate on the ladder to automatically `niove -the saine to elevated position ynotWithsta-iriding the engagement of said nut with the screw, lineans t'or turning said screw to depress the la-dt er, ineans for locking the ladder in prone position, Iand means rindependent of the said locking means for lool:- ing the ladder in other positions.

In a ladder yor' the kind described, the combination with the ladder proper, a fulcruni on which the saine can be elevated, a pair of springs, plunger rods operated by the springs, a bar connecting the plunger rods, link rods connecting said bar with the ladder, and ineans t'or engaging said bar to locllrthe ladder in prone position including a ypair of gripping jaws, a rod for operating the saine to grip said bar to lock the ladder in prone posit-ion, means for operating said rod, and ineans for locking said last nained means.

8. in a ladder of the kind described, "the combination with the ladder proper, a ful cruni on Which the saine can be elevated, a pair of springs, plunger rods operated by the springs, a bar connecting the plunger rods, link rods connecting said bar with the ladder, and means :tor engaging said bar to lock ythe ladder in prone positioninoluding a pair of gripping jaws, a rod iort opera-ting the saine ro grip said vbar to lock the ladder in `prone position, ineans for operating said 1od Iin one direction to close :the jaws and a spring 'for urging said rod `to open the aivs.

4l. In `a ladder of the kind described, the combination with `the ladder proper yand a `i'nlcruni `on which the saine can be elevated, a screw '26, a -nu-t on the ladder to engage said screw, and :means adapted to operate on vthe ladder to'elevate the saine and automatically canse the nut to inove longitudinally on the screw, nieans 1for positively depressing the ladder, in-eans vfor locking the ladder in prone :position and means independent ot said locking means for locking the ladder in other positions.

errantes r. Kissen.

qWitnesses n BENJAMIN FINGKEL,

i Y1 Meyrin L* oAfRD.

Copies oft'ns patent may ne obtained Vfor five cents each, by addressing the "Commissioner of Patents, Washington, D. C. 

